2 times the number π, which is approximately 3.141592654
Using 3.14 is usually good enough, so the answer to your question is 6.28. ■
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The length of a radius is not the length of a diameter. The diameter is two times the length of the radius.
Because 2 times the radius is equal to the diameter of the circle
The circumference of a circle equals the diameter times pi. The diameter is two times the radius. So a circle with a radius of 6 would have a diameter of 12, and a circumference of 12pi.
Circumference equals the diameter times pi. The diameter is 2 times radius. Radius equals Circumference divided by pi then divided by 2.
24 meters diameter is simply two times the radius.